串口问题求助各位：接收中断进不去

钱队长 · 发表于 2015-11-5 18:40:11

串口驱动头文件 Bsp_Usart_Driver.h
#define GPIOA_RS485_CS_PIN    GPIO_Pin_8
#define GPIOA_RS485_TX_PIN    GPIO_Pin_9
#define GPIOA_RS485_RX_PIN    GPIO_Pin_10
#define GPIOA_RS485_SPEED     GPIO_Speed_50MHz
#define GPIOA_RS485_CS_MODE   GPIO_Mode_Out_PP
#define GPIOA_RS485_TX_MODE   GPIO_Mode_AF_PP
#define GPIOA_RS485_RX_MODE   GPIO_Mode_IN_FLOATING

typedef enum
{
    RS485_BAUDRATE_9600 = 9600,
    RS485_BAUDRATE_19200 = 19200
}Rs485_BaudRate_TypeDef;

串口驱动源文件   Bsp_Usart_Driver.c
Status_TypeDef Bsp_Usart_Init(Rs485_BaudRate_TypeDef baudRate)
{
    GPIO_InitTypeDef Gpio_InitStruct;
    USART_InitTypeDef Rs485_InitStruct;
    NVIC_InitTypeDef Nvic_InitStruct;

    /*Gpio及Usart时钟使能*/
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA ,ENABLE);
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);

    /*Gpio CS，Tx，Rx配置*/
    Gpio_InitStruct.GPIO_Pin = GPIOA_RS485_CS_PIN;
    Gpio_InitStruct.GPIO_Speed = GPIOA_RS485_SPEED;
    Gpio_InitStruct.GPIO_Mode = GPIOA_RS485_CS_MODE;
    GPIO_Init(GPIOA, &Gpio_InitStruct);             // CS

    Gpio_InitStruct.GPIO_Pin = GPIOA_RS485_TX_PIN;
    Gpio_InitStruct.GPIO_Mode = GPIOA_RS485_TX_MODE;
    Gpio_InitStruct.GPIO_Speed = GPIOA_RS485_SPEED;
    GPIO_Init(GPIOA, &Gpio_InitStruct);             // Tx

    Gpio_InitStruct.GPIO_Pin = GPIOA_RS485_RX_PIN;
    Gpio_InitStruct.GPIO_Mode = GPIOA_RS485_RX_MODE;
    Gpio_InitStruct.GPIO_Speed = GPIOA_RS485_SPEED;
    GPIO_Init(GPIOA, &Gpio_InitStruct);             // Rx

USART_DeInit(USART3);
USART_StructInit(&Rs485_InitStruct);

    Rs485_InitStruct.USART_BaudRate = baudRate;
    Rs485_InitStruct.USART_WordLength = USART_WordLength_8b;
    Rs485_InitStruct.USART_StopBits = USART_StopBits_1;
    Rs485_InitStruct.USART_Parity = USART_Parity_No;
    Rs485_InitStruct.USART_Mode = (USART_Mode_Rx | USART_Mode_Tx);
    Rs485_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

USART_Init(USART3,&Rs485_InitStruct);

    /*Rs485中断优先级配置 */
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
    Nvic_InitStruct.NVIC_IRQChannel = USART3_IRQn ;
    Nvic_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
    Nvic_InitStruct.NVIC_IRQChannelSubPriority = 1;
    Nvic_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&Nvic_InitStruct);

USART_ITConfig(USART3,USART_IT_RXNE, ENABLE); //RS485接收中断
USART_Cmd(USART3,ENABLE);

GPIO_ResetBits(GPIOA,GPIOA_RS485_CS_PIN); // 管脚拉低，置为接收状态

    return Status_OK;
中断头文件 :stm32f10x.h
void USART3_IRQHandler(void);
中断源文件 stm32f10x.c
void USART3_IRQHandler(void)
{
    if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET)
    {
        Rs485_1_DealWithRxIRQ();
    }

    USART_ClearFlag(USART3, USART_FLAG_RXNE);
}
时钟配置：
Status_TypeDef Bsp_Rcc_Init(void)
{
    SystemInit();
    /*配置AHB:72Mhz,APB1:36Mhz,APB2:72Mhz*/
    RCC_HCLKConfig(RCC_SYSCLK_Div1);
    RCC_PCLK1Config(RCC_HCLK_Div2);
    RCC_PCLK2Config(RCC_HCLK_Div1);

return Status_OK;
}

钱队长 · 发表于 2015-11-5 18:45:03

用USB转串口工具，通过RS485接到板子上面，通过串口调试工具给板子发报文，程序再跑，在串口接收中断函数里面打断点，无法进入，定时器中断啥的都能进去。理论上应该是一发就马上进入接收中断的啊，小弟把上面的程序和网上搜着的帖子仔细对了好几遍不知道哪里出问题，还望各位多多指点！怀疑是不是系统时钟没配置对，使用的芯片是F107